You're right reflex the Super is definitely in the magnum class of cartridge. I think the 10mm and 357 mag are pretty evenly matched though. If you go by load tables looks like the 357 has the slight edge. Of course it could be that most of the 10mm data is from shorter barrels 5" semiauto pistols , but then you would think not having a cylinder gap would help velocity. Whoa I see here 180 grain XTP with 13 grains of AA No. 9 at 1437fps from a Desert Eagle.357.but not even close to your 45 super.